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LONG-TERM INVESTMENTS (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Investments, Debt and Equity Securities [Abstract] |  |
Severance-pay funds | $ 11,942 | $ 10,472
Long-term bank deposits | 12,500 | 12,500
Investments in privately held companies | 15,155 | 17,727
Long-term investments, total | $ 39,597 | $ 40,699

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